CFM International LEAP-1B28 series
675 aircraft on the U.S. register carry a CFM International LEAP-1B28 series engine, rated at about 29,317 pounds of thrust. The Boeing 737 is the model most often fitted with it (675 aircraft). The aircraft carrying it were built between 2017 and 2026.
The FAA records engines by code, usually at the level of a series ("O-320 series") rather than the exact variant; this page gathers every FAA code that reads as CFM International LEAP-1B28 series. FAA spelling: LEAP-1B28 SER.
Where they are owner's state
Kind of aircraft
By kind, as a table
| aircraft | share | |
|---|---|---|
| Airliners and large jets | 675 | 100% |
What the FAA has certified, ordered and been told about the CFM International LEAP-1B28 series the component layer
The design is held under 2 type certificates. The FAA has issued 28 airworthiness directives (orders that owners must comply with) that name this engine series. Operators and repair shops have filed 335 failure reports with the FAA since 1995, 335 of them in the last ten years.
FAA orders 28 airworthiness directives · newest first
2026-07-272026-14-06 · Turbine Section · engine
2026-02-252026-02-08 · Engine Controls · engine
2025-12-292025-21-03 · Turbine section · engine
2025-08-252025-14-08 · Turbine Section · engine
2025-07-252025-12-03 · Turbine Engine Compressor Section; Turbine Section · engine
2025-04-082025-04-12 · Turbine Section · engine
Failure reports 335 since · what operators and shops told the FAA
Failure reports by year, as a table
| reports | |
|---|---|
| 18 | 6 |
| 19 | 2 |
| 20 | 2 |
| 21 | 18 |
| 22 | 82 |
| 23 | 53 |
| 24 | 42 |
| 25 | 76 |
| 26 | 54 |
Parts most often reported as the reports name them
Engine65Sensor17Pump14Warning Light13Bolt10Anti-Ice Valve9Exciter8Warning Message8Igniter7Oil System7
Parts most reported, as a table
| reports | |
|---|---|
| Engine | 65 |
| Sensor | 17 |
| Pump | 14 |
| Warning Light | 13 |
| Bolt | 10 |
| Anti-Ice Valve | 9 |
| Exciter | 8 |
| Warning Message | 8 |
| Igniter | 7 |
| Oil System | 7 |
Latest reports
2026-09-21Sensor: faulted
2026-09-19Oven: odor
2026-09-19Ground Wire: failed
2026-09-07Engine: shutdown
2026-09-07Engine: auto shutdown
Certificates and bulletins
E00089ENType certificate held by Cfm International S.A. · 34 models listed · revised May 12, 2026
E00088ENType certificate held by Cfm International S.A. · 11 models listed · revised April 1, 2026
Sources: the FAA's type certificate data sheets, airworthiness directives, supplemental type certificates, special conditions and special airworthiness information bulletins (Dynamic Regulatory System), and the FAA's service difficulty reports. A failure report is what an operator or repair station chose to file; the counts show reporting as much as reliability, and larger and commercial fleets report more. How the systems are grouped.
Connections how this engine series links to the rest of the register
Fitted to
- Boeing 737 675 with this engine series
Where they are
- Texas 279 of these aircraft
- Illinois 134 of these aircraft
- Utah 130 of these aircraft
- Washington 84 of these aircraft
- Delaware 41 of these aircraft
Biggest operators
- Southwest Airlines CO 275 of these aircraft
- United Airlines INC 134 of these aircraft
- Umb Bank Na Trustee 99 of these aircraft
- Alaska Airlines INC 78 of these aircraft
- Wilmington Trust CO Trustee 36 of these aircraft
Airworthiness
- FAA orders naming the CFM International LEAP-1B28 series 28 airworthiness directives
- Failure reports on the CFM International LEAP-1B28 series 335 reports since 1995
Analytics
These connections as data: /graph/engine/cfm-international-leap-1b28-series.json · about the eFlight graph.
Aircraft newest certificates first · 675
| Tail no. | Maker and model | Group | Owner and base | Certificate | Registered | Status |
|---|---|---|---|---|---|---|
| N291BT | Boeing 737-9 |
Fixed-wing, multi-engine | Alaska Airlines INC Seattle, Washington |
Standard | 2021-07-30 | ValidFAA registration status code V: Valid registration. All codes |
| N110JS | Boeing 737-8 |
Fixed-wing, multi-engine | Bank of Utah Trustee Salt Lake City, Utah |
Standard | 2021-06-25 | ValidFAA registration status code V: Valid registration. All codes |
| N105JS | Boeing 737-8 |
Fixed-wing, multi-engine | Bank of Utah Trustee Salt Lake City, Utah |
Standard | 2021-06-15 | ValidFAA registration status code V: Valid registration. All codes |
| N8815L | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2021-06-11 | ValidFAA registration status code V: Valid registration. All codes |
| N8807L | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2021-06-07 | ValidFAA registration status code V: Valid registration. All codes |
| N115AM | Boeing 737-9 |
Fixed-wing, multi-engine | Alc B379 122019 LLC Camden, Delaware |
Standard | 2021-06-03 | ValidFAA registration status code V: Valid registration. All codes |
| N8804L | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2021-05-28 | ValidFAA registration status code V: Valid registration. All codes |
| N8809L | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2021-05-27 | ValidFAA registration status code V: Valid registration. All codes |
| N8808Q | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2021-05-25 | ValidFAA registration status code V: Valid registration. All codes |
| N8806Q | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2021-05-13 | ValidFAA registration status code V: Valid registration. All codes |
| N919AK | Boeing 737-9 |
Fixed-wing, multi-engine | Alaska Airlines INC Seattle, Washington |
Standard | 2021-05-08 | ValidFAA registration status code V: Valid registration. All codes |
| N8802Q | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2021-05-05 | ValidFAA registration status code V: Valid registration. All codes |
| N8801Q | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2021-04-24 | ValidFAA registration status code V: Valid registration. All codes |
| N8817L | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2021-04-21 | ValidFAA registration status code V: Valid registration. All codes |
| N918AK | Boeing 737-9 |
Fixed-wing, multi-engine | Alaska Airlines INC Seatac, Washington |
Standard | 2021-04-21 | ValidFAA registration status code V: Valid registration. All codes |
| N8800L | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2021-04-16 | ValidFAA registration status code V: Valid registration. All codes |
| N8803L | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2021-04-16 | ValidFAA registration status code V: Valid registration. All codes |
| N8818Q | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2021-04-14 | ValidFAA registration status code V: Valid registration. All codes |
| N915AK | Boeing 737-9 |
Fixed-wing, multi-engine | Alaska Airlines INC Seattle, Washington |
Standard | 2021-04-08 | ValidFAA registration status code V: Valid registration. All codes |
| N27526 | Boeing 737-9 |
Fixed-wing, multi-engine | Wilmington Trust CO Trustee Wilmington, Delaware |
Standard | 2021-02-09 | ValidFAA registration status code V: Valid registration. All codes |
| N37528 | Boeing 737-9 |
Fixed-wing, multi-engine | Wilmington Trust CO Trustee Wilmington, Delaware |
Standard | 2021-02-08 | ValidFAA registration status code V: Valid registration. All codes |
| N913AK | Boeing 737-9 |
Fixed-wing, multi-engine | Alaska Airlines INC Seattle, Washington |
Standard | 2021-02-08 | ValidFAA registration status code V: Valid registration. All codes |
| N37522 | Boeing 737-9 |
Fixed-wing, multi-engine | Wilmington Trust CO Trustee Wilmington, Delaware |
Standard | 2021-01-22 | ValidFAA registration status code V: Valid registration. All codes |
| N37525 | Boeing 737-9 |
Fixed-wing, multi-engine | Wilmington Trust CO Trustee Wilmington, Delaware |
Standard | 2021-01-22 | ValidFAA registration status code V: Valid registration. All codes |
| N37518 | Boeing 737-9 |
Fixed-wing, multi-engine | Wilmington Trust CO Trustee Wilmington, Delaware |
Standard | 2021-01-14 | ValidFAA registration status code V: Valid registration. All codes |
| N37527 | Boeing 737-9 |
Fixed-wing, multi-engine | Wilmington Trust CO Trustee Wilmington, Delaware |
Standard | 2021-01-12 | ValidFAA registration status code V: Valid registration. All codes |
| N37530 | Boeing 737-9 |
Fixed-wing, multi-engine | Wilmington Trust CO Trustee Wilmington, Delaware |
Standard | 2021-01-07 | ValidFAA registration status code V: Valid registration. All codes |
| N37516 | Boeing 737-9 |
Fixed-wing, multi-engine | Wilmington Trust CO Trustee Wilmington, Delaware |
Standard | 2020-12-30 | ValidFAA registration status code V: Valid registration. All codes |
| N27520 | Boeing 737-9 |
Fixed-wing, multi-engine | Wilmington Trust CO Trustee Wilmington, Delaware |
Standard | 2020-12-29 | ValidFAA registration status code V: Valid registration. All codes |
| N37523 | Boeing 737-9 |
Fixed-wing, multi-engine | Wilmington Trust CO Trustee Wilmington, Delaware |
Standard | 2020-12-21 | ValidFAA registration status code V: Valid registration. All codes |
| N27519 | Boeing 737-9 |
Fixed-wing, multi-engine | Wilmington Trust CO Trustee Wilmington, Delaware |
Standard | 2020-12-09 | ValidFAA registration status code V: Valid registration. All codes |
| N8722L | Boeing 737-8 |
Fixed-wing, multi-engine | Umb Bank Na Trustee Salt Lake City, Utah |
Standard | 2020-08-03 | ValidFAA registration status code V: Valid registration. All codes |
| N8723Q | Boeing 737-8 |
Fixed-wing, multi-engine | Umb Bank Na Trustee Salt Lake City, Utah |
Standard | 2020-08-03 | ValidFAA registration status code V: Valid registration. All codes |
| N8728Q | Boeing 737-8 |
Fixed-wing, multi-engine | Umb Bank Na Trustee Salt Lake City, Utah |
Standard | 2020-08-03 | ValidFAA registration status code V: Valid registration. All codes |
| N8729H | Boeing 737-8 |
Fixed-wing, multi-engine | Umb Bank Na Trustee Salt Lake City, Utah |
Standard | 2020-08-03 | ValidFAA registration status code V: Valid registration. All codes |
| N8730Q | Boeing 737-8 |
Fixed-wing, multi-engine | Umb Bank Na Trustee Salt Lake City, Utah |
Standard | 2020-08-03 | ValidFAA registration status code V: Valid registration. All codes |
| N8731J | Boeing 737-8 |
Fixed-wing, multi-engine | Umb Bank Na Trustee Salt Lake City, Utah |
Standard | 2020-08-03 | ValidFAA registration status code V: Valid registration. All codes |
| N8702L | Boeing 737-8 |
Fixed-wing, multi-engine | Umb Bank Na Trustee Salt Lake City, Utah |
Standard | 2020-06-16 | ValidFAA registration status code V: Valid registration. All codes |
| N8724J | Boeing 737-8 |
Fixed-wing, multi-engine | Umb Bank Na Trustee Salt Lake City, Utah |
Standard | 2020-06-16 | ValidFAA registration status code V: Valid registration. All codes |
| N8725L | Boeing 737-8 |
Fixed-wing, multi-engine | Umb Bank Na Trustee Salt Lake City, Utah |
Standard | 2020-06-16 | ValidFAA registration status code V: Valid registration. All codes |
| N27752 | Boeing 737-10 |
Fixed-wing, multi-engine | Boeing CO Renton, Washington |
Experimental | 2019-08-01 | ValidFAA registration status code V: Valid registration. All codes |
| N27751 | Boeing 737-10 |
Fixed-wing, multi-engine | Boeing CO Renton, Washington |
Experimental | 2019-07-30 | ValidFAA registration status code V: Valid registration. All codes |
| N37514 | Boeing 737-9 |
Fixed-wing, multi-engine | United Airlines INC Chicago, Illinois |
Standard | 2019-03-01 | ValidFAA registration status code V: Valid registration. All codes |
| N37513 | Boeing 737-9 |
Fixed-wing, multi-engine | United Airlines INC Chicago, Illinois |
Standard | 2019-02-27 | ValidFAA registration status code V: Valid registration. All codes |
| N47512 | Boeing 737-9 |
Fixed-wing, multi-engine | United Airlines INC Chicago, Illinois |
Standard | 2019-01-31 | ValidFAA registration status code V: Valid registration. All codes |
| N37510 | Boeing 737-9 |
Fixed-wing, multi-engine | United Airlines INC Chicago, Illinois |
Standard | 2019-01-22 | ValidFAA registration status code V: Valid registration. All codes |
| N27511 | Boeing 737-9 |
Fixed-wing, multi-engine | United Airlines INC Chicago, Illinois |
Standard | 2018-12-31 | ValidFAA registration status code V: Valid registration. All codes |
| N27509 | Boeing 737-9 |
Fixed-wing, multi-engine | United Airlines INC Chicago, Illinois |
Standard | 2018-11-29 | ValidFAA registration status code V: Valid registration. All codes |
| N8727M | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2018-11-17 | ValidFAA registration status code V: Valid registration. All codes |
| N8726H | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2018-11-09 | ValidFAA registration status code V: Valid registration. All codes |
| N8721J | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2018-11-06 | ValidFAA registration status code V: Valid registration. All codes |
| N37507 | Boeing 737-9 |
Fixed-wing, multi-engine | United Airlines INC Chicago, Illinois |
Standard | 2018-10-01 | ValidFAA registration status code V: Valid registration. All codes |
| N8720L | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2018-09-08 | ValidFAA registration status code V: Valid registration. All codes |
| N8719Q | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2018-08-28 | ValidFAA registration status code V: Valid registration. All codes |
| N8701Q | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2018-07-31 | ValidFAA registration status code V: Valid registration. All codes |
| N47505 | Boeing 737-9 |
Fixed-wing, multi-engine | United Airlines INC Chicago, Illinois |
Standard | 2018-06-04 | ValidFAA registration status code V: Valid registration. All codes |
| N8718Q | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2018-06-04 | ValidFAA registration status code V: Valid registration. All codes |
| N37506 | Boeing 737-9 |
Fixed-wing, multi-engine | United Airlines INC Chicago, Illinois |
Standard | 2018-05-30 | ValidFAA registration status code V: Valid registration. All codes |
| N37504 | Boeing 737-9 |
Fixed-wing, multi-engine | United Airlines INC Chicago, Illinois |
Standard | 2018-05-21 | ValidFAA registration status code V: Valid registration. All codes |
| N27503 | Boeing 737-9 |
Fixed-wing, multi-engine | United Airlines INC Chicago, Illinois |
Standard | 2018-05-01 | ValidFAA registration status code V: Valid registration. All codes |
| N37502 | Boeing 737-9 |
Fixed-wing, multi-engine | United Airlines INC Chicago, Illinois |
Standard | 2018-04-26 | ValidFAA registration status code V: Valid registration. All codes |
| N8717M | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2018-04-24 | ValidFAA registration status code V: Valid registration. All codes |
| N67501 | Boeing 737-9 |
Fixed-wing, multi-engine | United Airlines INC Chicago, Illinois |
Standard | 2018-04-23 | ValidFAA registration status code V: Valid registration. All codes |
| N8715Q | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2017-12-04 | ValidFAA registration status code V: Valid registration. All codes |
| N8716B | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2017-11-28 | ValidFAA registration status code V: Valid registration. All codes |
| N8713M | Boeing 737-800 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2017-10-31 | ValidFAA registration status code V: Valid registration. All codes |
| N8714Q | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2017-10-31 | ValidFAA registration status code V: Valid registration. All codes |
| N8709Q | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2017-10-26 | ValidFAA registration status code V: Valid registration. All codes |
| N8712L | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2017-10-25 | ValidFAA registration status code V: Valid registration. All codes |
| N8706W | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2017-10-06 | ValidFAA registration status code V: Valid registration. All codes |
| N8711Q | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2017-10-04 | ValidFAA registration status code V: Valid registration. All codes |
| N8708Q | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2017-09-27 | ValidFAA registration status code V: Valid registration. All codes |
| N8705Q | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2017-09-12 | ValidFAA registration status code V: Valid registration. All codes |
| N8710M | Boeing 737-8 |
Fixed-wing, multi-engine | Southwest Airlines CO Dallas, Texas |
Standard | 2017-09-11 | ValidFAA registration status code V: Valid registration. All codes |
| N562BJ | Boeing 737-8 |
Fixed-wing, multi-engine | Individual owner Utah |
Standard | PendingFAA registration status code R: Registration pending. All codes |
Previous Page 7 of 7
Source: FAA Civil Aviation Registry, Releasable Aircraft Database (the engine reference table and each aircraft's engine code), October 7, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.